NOISE ELIMINATING CIRCUIT

A noise eliminating circuit comprising a noise eliminating filter for moving image part to be used when an input image is of the moving image part, a noise eliminating filter for stationary image part to be used when the input image is of the station image part, these filters being adaptively selected between according to a motion of the input image, a detecting circuit for detecting the motion of the input image, and a selecting circuit for selecting between outputs of these filters based on an output of the detecting circuit, wherein the noise eliminating circuit for stationary image part outputs an average input image of number of stationary frames n to be entered. The novel constitution effectively suppresses a noise introduced in a moving image or a stationary image, generating an output signal with a good picture quality. Further, if outputs of the filters are adaptively mixed according to the motion of the input signal, a picture quality at a transition point between the moving image and the stationary image is substantially improved.